SEEDS, M. A. (1987). Horisons Exploring The Universe Michael A. Seeds. Wasworth.
Lua i Stíl Chicago (17ú heag.)SEEDS, Michael A. Horisons Exploring The Universe Michael A. Seeds. Wasworth, 1987.
Lua MLA (8ú heag.)SEEDS, Michael A. Horisons Exploring The Universe Michael A. Seeds. Wasworth, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.